package com.hmdp.service.impl;

import cn.hutool.core.lang.UUID;
import com.hmdp.service.ILock;
import org.springframework.core.io.ClassPathResource;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;

import java.util.Collections;
import java.util.concurrent.TimeUnit;

/**
 * Description:
 *
 * @Author
 * @Create 2025/3/17 19:04
 * @Version
 */
public class SimpleRedisLock implements ILock {
    private StringRedisTemplate stringRedisTemplate;
    private String name;

    private static final String KEY_PREFIX = "lock:";
    private static final String ID_PREFIX = UUID.randomUUID ().toString (true) + "-";
    private static final DefaultRedisScript<Long> UNLOCK_SCRIPT;
    static {
        UNLOCK_SCRIPT = new DefaultRedisScript<> ();
        UNLOCK_SCRIPT.setLocation (new ClassPathResource ("unlock.lua"));
        UNLOCK_SCRIPT.setResultType (Long.class);
    }

    public SimpleRedisLock(StringRedisTemplate stringRedisTemplate, String name) {
        this.stringRedisTemplate = stringRedisTemplate;
        this.name = name;
    }

    @Override
    public void unLock() {
        stringRedisTemplate.execute (UNLOCK_SCRIPT,
                Collections.singletonList (KEY_PREFIX + name),
                ID_PREFIX + Thread.currentThread().getId ());
    }

//    @Override
//    public void unLock() {
//        String threadId = ID_PREFIX + Thread.currentThread().getId();
//        String id = stringRedisTemplate.opsForValue ().get (KEY_PREFIX + name);
//        if (threadId.equals (id)){
//            stringRedisTemplate.delete (KEY_PREFIX + name);
//        }
//    }

    @Override
    public boolean tryLock(long timeoutSec) {
        String threadId = ID_PREFIX + Thread.currentThread().getId();
        Boolean success = stringRedisTemplate.opsForValue()
                .setIfAbsent(KEY_PREFIX + name, threadId, timeoutSec, TimeUnit.SECONDS);
        return Boolean.TRUE.equals(success);
    }
}
